What is standard stream object

Question

iostream

Answer 1

Standard stream objects are objects defined to work with I/O streams of C++ standards. These objects are included in the <iostream> header.

http://www.cplusplus.com/reference/iostream/

Answer 2

thanks

Answer 3

the standard streams in C++ are
cout, cin and cerr
in C are
stdout, stdin, stderr
also are file streams, string streams, etc